The sanctions target North Korean agents working in Russia, China, Vietnam and Cuba, whom the Treasury Department accuses of helping to procure components for North Korean weapons programs or the financial networks that help them happen. Still, he said the United States could "totally" handle the situation in North Korea without China's help.
Another worked for a North Korean trading company in Dalian, China, the U.S. Treasury said.
North Korea has made no secret of its ambitions to build a missile capable of reaching the continental United States, and Kim Jong Un said in a January 1 address that his regime had "entered the final stage of preparation for a test-launch of an intercontinental ballistic missile".
"If China is not going to solve North Korea, we will".
The comments, in an interview published on Sunday by the Financial Times, appeared created to pressure Chinese President Xi Jinping ahead of his visit to Trump's Mar-a-Lago resort in Florida this week.
War games are now raging as the United States and South drill for the possibility of war with North Korea.
China confirms return of Kim Jong-nam's body
It was released as part of a deal under which nine Malaysians previously prevented from leaving North Korea have now arrived home. Police chief Khalid said the North Korean embassy had at first confirmed the identity, but changed its stance the next day.
Ties between the two countries have worsened recently as North Korea continues to expand its nuclear weapons and missile programs.
North Korea's foreign ministry issued another angry diatribe against the exercises Thursday, saying that it would "mount a resolute preemptive attack" if it thought the United States was about to strike it. "And if they do that will be very good for China, and if they don't it won't be good for anyone". They have been "playing" the United States for years.
It is the urgent demand for preventing a war and protecting peace to wipe out the traitors bringing a nuclear war disaster while serving the U.S.in disregard of the destiny and interests of the nation, the letter said.
She said the condemnation will stand because "we can't change what they did, but we can sure change our actions in how we deal with it". "The only country that can stop North Korea is China, and they know that". The resolution denouncing North Korea also includes calls for swift deployment of the THAAD missile defense system on the Korean Peninsula.
If Washington sees changes it likes, it will remain a member and if not "we'll put out", she said.
"I think North Korea's midfield and side backs lack experience, so we'll have to take advantage of that", he said.